MOD: making more progress to having the jpg image binary data into a hash

libs/crypto_pub.py

@@ -11,13 +11,26 @@ class Signature:
   key_data  = None
   pub_key   = None
   sig_data  = None
+  hh        = None
 
   #
   def __init__(self):
+    hh = SHA512.new()
     self.genKeys()  
 
   #
-  def genSig(self, bin_data):
+  def genSig(self, hshh):
+    signer = PKCS1_v1_5.new(self.key_data)
+    self.sig_data  = signer.sign(hshh)
+    return self.sig_data 
+
+  #
+  def verifySig(self, hshh, bin_sig):
+    verifier = PKCS1_v1_5.new(self.pub_key)
+    return verifier.verify(hshh, bin_sig)
+
+  #
+  def genSig222(self, bin_data):
     hshh = SHA512.new()
     hshh.update(bin_data)
     signer = PKCS1_v1_5.new(self.key_data)
@@ -25,7 +38,7 @@ class Signature:
     return self.sig_data 
 
   #
-  def verifySig(self, bin_data, bin_sig):
+  def verifySig222(self, bin_data, bin_sig):
     hshh = SHA512.new()
     hshh.update(bin_data)
     verifier = PKCS1_v1_5.new(self.pub_key)

libs/jpg_bin.py

@@ -29,6 +29,11 @@ class JpgBin:
   data_idx = 0
   data_len = 0
   fh       = None
+  hh       = None
+
+  markers  = {
+    'SOS': 0xffd9
+  }
 
   continue_process = True
 
@@ -48,20 +53,39 @@ class JpgBin:
     return False
 
   #
-  def processFile(self, fhandle):
-    self.fh = fhandle
+  def processFile(self, file_h):
+    self.fh = file_h
     self.getMoreBytes(True)
     if (self.data_buf):
       if (not self.__isJPG()):
         return False
 
       while(self.continue_process):
-        self.findMarker()
+        self.findAllMarker()
         self.getMoreBytes()
 
       return True
     return False
 
+  #
+  def genHash(self, file_h, hash_h):
+    self.hh = hash_h
+    self.processFile(file_h)
+
+    while(self.continue_process):
+      if (self.findMarker(self.makers['SOS'])):
+        self.genImgHash()
+      self.getMoreBytes()
+
+    return self.hh
+
+  #
+  def genImgHash(self):
+    self.hh.update(self.data_buf[self.data_idx:])
+    while(self.continue_process):
+      self.getMoreBytes()
+      self.hh.update(self.data_buf)
+
   #
   def getMoreBytes(self, force_bytes=False):
     if (self.data_idx >= (self.data_len-1) or force_bytes):
@@ -91,7 +115,12 @@ class JpgBin:
     return pos
 
   #
-  def findMarker(self):
+  def findMarker(self, marker):
+
+    pass
+
+  #
+  def findAllMarker(self):
     (word_b,) = struct.unpack('>H', self.data_buf[self.data_idx:self.data_idx+2])
     hex_str = word_b.to_bytes(2, 'big').hex()
     # RST 0xD(n) (n==0..7)
@@ -138,11 +167,27 @@ class JpgBin:
     else:
       self.data_idx += 1
 
+
+  #
+  # Image Metadata, Exif
+  #
+  #
+  def markerAppData(self):
+    self.calcSeekBytes()
   #
   def markerComment(self):
     self.calcSeekBytes()
 
   #
+  # Image Data
+  #
+  #
+  def markerSOS(self):
+    self.calcSeekBytes()
+
+  def markerRST(self):
+    self.data_idx += 2
+
   def markerDQT(self):
     self.calcSeekBytes()
 
@@ -161,18 +206,10 @@ class JpgBin:
   def markerDHT(self):
     self.calcSeekBytes()
 
-  def markerSOS(self):
-    self.calcSeekBytes()
-
-  def markerRST(self):
-    self.data_idx += 2
-
   def markerEOI(self):
     self.data_idx += 2
     # self.continue_process = False
 
-  def markerAppData(self):
-    self.calcSeekBytes()
 
   def __repr__(self):
     pass

libs/jpg_tools.py

@@ -17,13 +17,11 @@ class JpgTools:
 
   #
   def jpgHash(self):
-    pass
-
-  #
-  def getBytes(self, fname):
-    if (not self.fh):
     self.fh = open(fname, "rb")
-    self.data_buf = self.fh.read(self.BUF_CHUNK_SIZE)
+    self.jpg = JpgBin()
+    retval = self.jpg.processFile(self.fh)
+
+    print("processFile()=={}".format(retval))
 
   #
   def processFile(self, fname):